Cutting device



July 2, 1,929,A Q DICKSON 1,719,599

CUTTING DEVI CE Filed Aug. 3, 1925 2 sheets-Sheet l July 2, 1929. G. DlcKsoN l 1,719,599

CUTTING DEVICE Y Filed Aug. 5. 1925 2 sheets-sheen 2 EEE-84 EE-1U? ff f6 @Je EMM INVENTOR BY WJM ATTORNEYS llfrjplgl- Eff-17- fE-- Rif-1H- v of the same; Fig. 13isan elevation of a re- Patented July 2, 1929.

UNITED STATESv PATENT OFFICE.

GEORGE DICKSON, OF CHICAGO, ILLINOIS, ASSIGNOR TO T T-IE BBCOCKSL WIICOX COM-V PANY, OF BAYONNE, NEW JERSEY, A CORPORATION OF NEW JERSEY.

CUTTING DEVICE.

Application led August 3, 1925. `Serial No. 47,707.

This invention relates espcciallyto a device for cutting the'ends of tubes that are inserted in boiler heads, drums, etc., preparatory to their being expanded into place, although it is not restricted to this particular use. l/Vith this device, tubes which have been inserted into a drum head or the like can be chamfered on the inside and outside at the end thereof in one operation,so as to make the same suitable f'or being eX- panded into their seats. The tubes will preferably be treated before being inserted, so that their surfaces vwill be clean and smooth or free from corrosion or scale.

In manufacturing water tube boilers that are to carry high pressures, care should be exercised not to have any tube so shortthat insufficient material projectsr beyond the drum plate to provide for expansion intoplace. In order to prevent the tubes from being too short, the tubes are often made somewhat longer than necessary so as allow the removal of excessmaterial, thus making the tubesof the proper length. By the present invention, a convenient portable cutting and chamfering tool isprovided by which the work of cutting off the excess material at the ends of the tubes can-be readily performed, and the ends of the tubesv can be left in such shape thatfthey can be readily expanded into their seats so as to be held securely therein.

The invention will be understood from the description in connection with the accom-y panying drawings, in which'Fig. 1 is a per spective view showingv the device as it operates on a tube; Fig. 2 is a longitudinal seetion through the device; Fig. 3 is an enlarged detail showing how the tubes are cut orchamfered; Fig. 4 is a side view, partly in section, of the cutter head; Fig. 5 is an end view of the same shown partly in sec-v tion; Fig. 6 vis a cross sectionthrough the device along the line 6 6 of Fig. 2; Fig. 7

shows 'a side view and section of the split sleeves of the expansible plug; Fig. 8 is a side view of the driving sleeve, partly in section; Figs. 9 and 10 are views from opposite ends of Fig. 8; Fig. 11 is a side view of the driving spindle; Fig. 12 is an end view taining nut shown partly in sectiongFig. 14 is a side view of the saine; Fig. 15 is a side view of the shaft; Fig. 16 is an end view of the expanding nut; Fig. 17 is a side" view of tube, and the lower tube T shows a tube that was so long that'itwas inserted through the wall D of the drum farther thanwas necessary, the excess part having beencut way, as shown by the dot-ted lines. The cutter comprises a shaft. 1 (Fig. 2)A having a reduced end which is screw-thread'- ed, as shown at 2. The shaft 1 is provided with a flange 3 intermediate'to its ends and has a hole 4 through it. The end of the shaft 1 oppositethe threaded portion2 is provided with a threaded hole 5 for. .stud

bolt 11. The shaft 1 carries a hollow internally-threaded nut 6 with a conically-shape'd external portion on the threaded end 2 of. shaft 1. An expansible plug 7Y is inade of a plurality of sections assembled to form an expansible plug, and it is so shaped that its inner surface fits the conical surface ofthe nut 6. The expansible plug 7 is provided with one 0r more annular grooves' 8 in whiohjband or bands 9, preferably of coiled wire springs, are placed to hold the several sections in assembled relation around the nut 6. The sections of the expansible plug 7 are provided internally near one end thereof with an annular groove 10,l into which the flange 3 on shaft 1 projects, and the outside surface of the sections are roughened to provide gripping surfaces.

A short stud bolt 11 is screw-threaded tov tit tight into the threaded hole 5 in the end of theishaft 1, and this stud bolt 11 is provided with acollar or thrust bearing 12. driving sleeve 13 (Figs. 2 and 8) is journaled on this stationary shaft 1 and is provided with an internaly ring 14 which projects into the space between the end ofthe i may be cut straight across.

of the sleeve 13, and this sleeve is externally threaded at its end beyond the ring 17.

The sleeve 13 is provided with keyways 13 (Figs. 2 and 10) for the cutter head or milling cutter 19 to be mounted thereon. The cutter head 19 is keyed to the sleeve 13 by means of the key 20, so that it may slide longitudinally along this sleeve. Holes 21 (Figs. 4 and 5) extend through the cutter head 19 and may be brought into register with the holes 16 in sleeves 13 and the hole 4 in shaft 1. The cutter head 19 is provided with longitudinal recesses 22, in which cutters 23 may be fastened by means of screws 24. The ends of the cutters 23 may be of diffcrent shapes, as shown in Fig. 3, so that the inside and outside portions of the tube T may be chamfered, while the end thereof In this figure, some of the ends of the cutters 23 are shown as being farther advanced longitudinally than the others, merely for the sake of clearly showing their operation. A ring 25 (Figs. 2 and 20) made in segmental semicircular parts, is attached by means of screws to the end of the cutter head 19 to interlock with a feed sleeve 26 by its flange 27 at the end thereof (Figs. 2 and 19). The flange 27 extends into the space between the ring 25 `and an annular shoulder on the inside of `cutter head 19. A washer 23 preferably of bronze is interposed between the flange 27 and the annular shoulder on the cutter head 19, in order to reduce friction and take up the wear. The feed sleeve 26 is provided with an external ring 29, in which there are a number of holes 30 for convenience in inserting a rod or rods 31 with which toi hold or turn Vthe feed sleeve. The externallythreaded portion 32 of the sleeve 26 is surrounded by an internally-threaded feed nut 33, which may be screwed on sleeve 26 or adjusted thereon to different positions, so that the feed sleeve 26 and feed nut constitute, in effect, a longitudinally expansibie sleeve. The feed nut 33 is provided with an external ring 34 in which there are holes 35, for convenience in inserting a rod or rods 36 for turning the feed nut. The feed nut 33 terminates in an internally-cette]iding flange 37, which encompasses or surrounds a portion of the sleeve 13 beyond the ring 17.

An internally-threaded knuried cap 33 of cup shape screws on to the threaded end of the driving sleeve 13, and a washer 39 interposed between the cap 33 and feed nut 33.

The driving spindle 40 which is connected by means of the universal joint 41 with any convenient motor or driving means is conneet-ed by means of the lugs 42 thereon with the driving sleeve 13, the lugs 42 fitting into recesses 43 at the end of the sleeve 13 in the manner of a clutch. The driving spindle 40 passes through a hol-e 44 in the cap 33 which is readily removable to disconnect or detach the coacting clutch meni-` bers 42 and 43.

The device may be assembled as follows: The shaft 1 with the nut 6 and expansible plug 7 is inserted into a tube T, as shown in Figs. 1 and 2, and the shaft 1 is turned by inserting a. rod or pin in the hole 4 thereof, while plug 7 and nut 6 are kept from turning by friction, thus drawing the nut 6 into the expansible plug 7 and causing the sections thereof to expand and grip the inside of tube T, thus firmly and rigidly securing the shaft in place in alincment with the tube T. During this operation, the ring 3 on the shaft 1 prevents the expansible plug 7 from being drawn forward. The cutter head 19 and the feed sleeve 26 are slipped over sleeve 13 with theeutter head19 tting over the key 2O in the keyway 13 and with the two` halves of the ring 25 in place. The driving sleeve 13 may now be slipped over the end of the shaft until the ring` 14 contacts with the end of the shaft 1, after which the ball bearing 15 is put in place and the stud bolt 11 screwed into the end of the shaft 1. The feed nut 33 then slipped over the other end of the sleeve 13 and screwed into place. The driving spindle 40 is slipped into place with the lugs 42 in the recesses 43, after which the cap 33 is screwed on.

The operation is as follows: The driving spindle 40 is set in motion by the motor, thus revolving the sleeve 13 which carries the cutter head 19 and causes the ends of the various aifd dissimilar cutters 23 to cut the end of the tube VT, the thrust being taken care of by the ring 12 on the stud bolt 11. then it is desired to advance the cutter head 19, either the feed sleeve 26 or the feed nut is turned manually while the other is kept stationary, thus causing the cutter head 19 to be moved longitudinally so asto cut off more of the end of the tube T.

When it is desired to remove the device from the tube, the load on the cutters is released by a reverse movement of the feed mechanism A and rod or pin is inserted through a hole 21 in the cutter head 19, a hole 16 in the sleeve 13 and into a hole 4 in the shaft 1, which are brought into register with each other. The shaft 1 is then turned contrary to the cutting movement so as to cause the nut 6 to move longitudinally farther into the tube, thuspermitting the expansible plug 7 to collapse and permit removal of the device from the tube T.

I claim:

1. In a milling tool, a. solid shaft, expan sion means at one end of said shaft to secure it within a tube, a sleeve mounted for rotation on the opposite end of the shaft and a milling cutter carried on said sleeve and keyed thereto for rotation therewith and for movement longitudinally thereof.

2. Ina.- lnilling tool, a solid shaft, expantion onk the opposite endf of the shaft and a' milling Acutter carried on said sleeve and keyed thereto for rotation therewith, said millmg cutter havmg various dissimilar cut-k tteis positioned at its end to give a desired outline to the end of the tube. n

3. In a milling tool, a solid shaft, expansion means at one end of said shaft to secure it Within a tube, a sleeve mounted forrotation thereon and extending from the opposite end of the shaft and a milling cutter mounted for rotation With said sleeve and for movement longitudinally thereof. l

4. In a milling tool, a solid shaft, expansion means at one end of said shaft to secure it Within a tube, a sleeve mounted for rotation thereon and extending from the opposite end of the shaft and a milling cutter slidably Lmounted for rotation with ysaid sleeve, and detachable ,clutching means at said outer end for rotating said sleeve from a driven spindle.

5. In a milling tool, a shaft, expansiony means at one end thereof to secure said shaft Within a tube, a sleeve mounted for rotation thereon and xedly positioned longitudinally thereof, a milling cutter slidably mounted on a key longitudinally positioned on said sleeve and means for feeding the milling cutter along said sleeve consisting of a nut and a sleeve threaded in a telescoping manner with each other.

6. In a milling tool, a shaft, means at one end thereof to secure it Within a tube, a sleeve mounted for rotation on said shaft and extending from the opposite end thereof, an internal ring, a ball bearing cooperating With said ring to prevent longitudinal movement of said sleeve, a milling cutter slida'bly positioned on said sleeve and means for driving said sleeve.

7. In a milling tool, a solid shaft, means at one end thereof to secureit Within a tube,

a sleeve mounted for rotation thereon, friction reducing means retaining said sleeve against longitudinal movement relative to said shaft', a milling cutter slidably mounted for rotation with said sleeve, adjustable .means on said sleeve for varying the operating load on the milling cutter'and detachable driving means for said sleeve and cutter.

8. In a milling cutter for trimming the end of a tube, a shaft, a sleeve on said shaft, a. cutting member keyed tovsaid sleeve, and means to feed said member longitudinally on the sleeve. v Y

9. In a cutter, a shaft, alconical nut into which said shaft is thre aded,-an expansible plug surrounding said nut, a cutting member rotatable around said shaft, and means to feed said member longitudinally.

10. In a cutter, a shaft, a sleeve on said shaft, acutting member keyejdto said sleeve, a cap attached to said sleeve, and an expansible feed device between said cap and member.

11. In a cutter, a shaft, a sleeve on saidV shaft, a cutting member keyed to said sleeve, a cap attached to said sleeve, and an expansible feed device comprising a nut in thread-` ed engagement With a sleeve between saidv and member.'

12. In a milling tool for cutting tube ends a solid shaft, means to hold said shaft Within the tube, a sleeve rotatable on said shaft, a milling cutter on said sleeve and driven thereby, holes through the milling cutter and ysleeve and a hole in said shaft, -which holes may be brought into registry so that a pin maybe inserted through the milling cutter, and sleeve, and into the shaft to move these parts of the milling tool in unison.

13. In a cutting tool to cut the end of a tube, a shaft, a shaft support adapted to be expanded against the interior of the tube to v.hold the shaft in axial alinement With the tube, a cutting device carried by said shaft and arranged With cutters to act on the end of the tube, and means to feed the cutting device into and out of cutting position.l

14. In a cutting tool to cut the end of a tube, a shaft, a shaft support adaptedto be expanded against the interior of the tube to hold the shaft in axial alinement With the tube,` a cutting device rotatable on said shaft and arranged With cutters to act on the edge of the tube, and means to feed ythe cutting device into and out of cutting position.

l5. In a cutting tool to out the end of a tube, a shaft, a shaft support comprising a plurality of expansion members, means operable by thel rotation of the shaft to press said expansion members against the interior of the tube to hold the shaft in axial alinement with the tube, a cutting device rotatable on said shaft and arranged With cutters to act on the edge of the tube, and meansy to feed the cutting device into and out of cutting position.

16. In a cutting tool to cut the end of a f tube, a shaft, a shaft support adapted to ber expanded against the interior of the tube to hold the shaft in axial alinement With the tube, a cutting device rotatable on said shaft and arranged with cutters to act on the edge of the tube, means to feed 'the cutting device into and out of cutting position and a detachable clutching device for rotating said rotatable cutting device.

17. In a milling tool, a solid shaft,.a reduced threaded `end on said shaft, a conical nut on said threaded end, a split expansion block on said nut and retained by a flange on said shaft against displacement therealong, a sleeve rotatably mounted on said shaft and extending beyond the end thereof opposite said reduced end7 an internal ring on said sleeve and engaging said opposite end, a bolt threaded into said shaft, opposite said reduced end, a hall bearing unil; between the head of said holt and said ring for reeeivin r the longitudinal thrust of said sleeve, a milling; cutter secured by a relatively long key to Vsaid sleeve for sliding movement thereon, a Cap closing the end of said sleeve,

l0 a perforation in said cap furnishing a bearing for a spindle of a universal shaft, said Cap retaining a detachable clutch means through which seid universal shaft drives said sleeve, an internally threaded nut and an externally threaded sleeve (5o-operating with eaeh other between the end eap and the milling cutter to 'furnish a slow motion feed to said milling cutter and means for operat-` ing said feed.

GEORGE DIGKSON 

